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(No Model.) f a sheetssheet 1.

l H. B. BRIN. Maohinefor Threading Bolts and Nuts;

No. 237,47?. Patented Fe g, |881.

* L m mir- 1 WITNESSES: l rINVBB'TTOR I @Wy Q/FMQ/ v K ATTORNEYS.

N PETERS, PHOTGLITHOGIVNEF, WLSMNQTUN. D 6,

. (No Model.) a sheets-sheet 2.

H. B. B-URIN.

Mahine fo-rThreaQding Bolts and Nuts. No. 237,479. U Patented Feb.hs,'1ss1.

WITNES u I INVENTOR: 6 l@ M .E @www BY mgl@ ATTGRNEYS.

N-FETERS, PHO] OLITHOGRAFNE, WASHINGTON. D. C.

A nfl No Model.) sheets-sheet s.

` H. B. BURIN. Machneffor'Threading- Bolts and Nuts.

l No. 237,479. Patented Feb. s. |881.

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WITNEssEs: EVENTGR: @nA/MWL., cg Y ATTORNEYS.

' N. PETERS, PH`OT0 LITHDGRAFMER WASHINGTON, D C. I ,/f`\

UNITED STATES PATENT Errea.

HENRY B. BURIN, OF NEW YORK, N. Y.

MACHINE FOR THREADING BOLTS AND NUTS.

SPECIFICATION forming part of Letters Patent No. 237,479, dated February 8, 1881.

Application filed April 7, 1880.

To all whom 'it may concern Be it known that I, HENRY B. 4BURIY, of the city, county, and State of New York, have invented a new and useful Improvement in Machines for Threading Bolts and Nuts, of which the following is a specification.

Figure 1, Sheet 1, is a plan view of the improvement. Fig. 2, Sheet 1, is a sectional elevation taken through the line :c Fig. l. Fig. 3, Sheet 2, is a sectional elevation taken through the linev y y, Fig. l. Figs. 4, 5, and 6, Sheet 2, are det-ail views of one of the workholders. Fig. 7 is a sectional elevation showing the tongues and grooves by which wheels a-nd shafts are connected. Fig. 8 is a plan view of the segmental gearwheel, the wheels hat gear with it, and the diagonal shafts.

Similar lletters of reference indicate corre-` sponding parts.

The especial object of this invention is to furnish machines for cutting boltthreads and tapping nuts, so constructed that as one die or tap is forced forward to do its work another die or tap will be withdrawn from its work, so that the machine will work continuously and no time will be lostin withdrawing the die or tap.

The invention consists in the combination,.

armedlever, having' curved cross-head racks` upon its ends, whereby the one shaft is moved longitudinally in one direction by the longi` tudinal movement of the other shaft in the other direction and also in constructing the work-holders of a stationary plate having notches for the cleaning-brush to pass through and to discharge the work, the stationary upper plate having notches for the cleaningbrush' to pass through and to admit the work, and the intermediate revolving plate or head attached to a spindle' and having notches to receive the work and chips, whereby the work will be received, heldwhile being operated upon, and discharged, and the chips can be removed, as will be hereinafter fully described.

A represents the frame of the machine. B B' are two parallel shafts, which I prefer to make hollow to allow them to have a suitable size and strength without being too heavy.

(No model.)

The shafts BB revolve and slide longitudinally in bearings attached to the frame A.

To the ends of the shafts B B are attached holders C, to receive a tap, D, for tapping nuts, `or holders E, to receive dies F, for cu'ttingscrewthreads upon bolts. If desired, tap-holders C may be attached to both ends of both shafts, or die-holders E maybe attached to both ends of both shafts; or one or both shafts may have a tap-holder, C, at one end, and a. die-holder, E, at the other end, as circumstances may require. Y

Upon the shafts B B are placed two large gear-wheels, G Gr', the teeth of which mesh into each other, so that the shafts B B may be revolved at the same time and in opposite directions. The gear-wheels G G are swiveled to the bearings of the shafts B B', and are connected with the said shafts by tongues and grooves, so as to carry the shafts B B' with them in their revolution, while allowing the said shafts to have a free longitudinal movement.

Into the teeth of one of the gearwheels G Gf mesh the teeth of a smallV gear-wheel, H, attached to a short shaft, I, which revolves in an arm or bracket formed upon or attached to the frameA, and has a small bevel-gear wheel, J, attached to its outer end.

small bevel-gear wheel, K, attached to the shaft L, which revolves in bearings attached to the frame A, and has a fast pulley, M., and a loose pulley, N, attached to its end to` receive the driving-belt.

O are sockets or bearings formed in or attached to the frame A, and in which revolve vertical spindles P, havingcircular heads Q attached to their upper ends.. The heads Q are made of a thickness equal to the width ofthe nut or the head of the bolt to be operated upon.

In the edges of the heads Q, and at equal distances apart, are formed five radial notches, It, of such a size as to receive the nuts or the heads of the bolts to be operated upon, and of a depth equal to the thickness of the said nuts or bolt-heads. In the heads Q, at the bottoms of the notches R, are formed narrower radial notches S, to receive the chips made by the tapping-tools in cutting the threads. Each head Q is placed between two The teeth of theV bevel-gear wheel 'J mesh into the teeth ofa` IOO circular plates, T U, the lower one, T, of which is formed upon or attached to the upper end of the socket 0. The upper plate, U, is secured in place by bars V, attached to its edge and to the edge of the lower plate, In the plates T U, directly over each other, are Vformed notches W X, corresponding with the notches It S of the heads Q, so thatas the said notches B S come successively into place between the notches W X of the plates T U, a brush, Y, may be passed through the said notches to remove any chips that may be in the notches, and thus clean them ready to receive another nut or bolt-head. The brush Y may beoperated to pass it through the notches in the plates T U and head Q by a lever and cam or other suitable mechanism, which mechanism is not shown in the drawings. In the upper plate, U, in front of the notch W, and at a distance from it equal to the distance between the notches R in the head Q, is formed a notch, Z,I equal in size to the notches It WV, through which the nut or bolt-head is passed in inserting it in the notches R of the head Q. As the head Q moves forward, the nut orbolthead is kept in place in the notch B by the solid parts of the plates T U, between which it is carried.

In the lower plate, T, in the rear of the notch W, and at a distance from it equal to the distance apart of the notches It in the head Q, is formed a notch, a., of the same size as, or a little larger than, the notches R W Z, to allow the nut or bolt-head to drop through when it is brought over the said notch a by the head Q.

To the lower ends of the spindles l? are attached small bevel-gear wheels b, into the teeth of which mesh the teeth of the bevelgear wheels o, attached to the ends of the two shafts d. vThe two shafts d revolve in bearings attached to the frame A, and pass through the said frame A diagonally, so that the diago- Inal heads Q may be moved together.

To the middle parts of the shafts d are attached small bevel-gear wheels e, the teeth of- `which mesh into the teeth of bevel-gear wheels j',

attached to or formed upon the upper and lower sides ofa gear-wheel, g. The bevel-gear wheels f are segmental, the toothed segmen ts being arranged to revolve the shafts d alternately, au d at the proper intervals to turn the heads Q for the proper distance when the tools have been withdrawn from the nuts or bolts. The gearvwheels f g f are attached to a short vert-ical shaft, which revolves in bearings attached to the frame A,or to a bracket or hanger formed upon or attached to the said frame. The teeth of the gear-wheel g mesh into the teeth of a small gear-wheel, h, attached to the shaft t', which revolves in bearings in the frame A, and to which motion is given from the drivingshaft through a suitable connecting gearing,

which connecting gearing is not shown in the drawings.

j represents aV milling-tool, which revolves in some suitable support directly opposite the notch B, in the rear of the notch R, in which the die or tap works.

To the milling-tool j, or'its holder, is attached a small bevel-gear wheel, 7a, into the teeth of whichmesh the teeth of the bevelgear wheels Z, attached to the shafts m. The shafts on revolve in suitable supgorts, and are connected with and driven from the driving mechanism of the machine by suitable connecting gearing, which connecting gearing is not shown in the drawings. The millingtool j is intendedto smooth off or round the end of a bolt, or to dress the face of a nut and ream out the hole punched or drilled in ring gear teeth n, into which mesh the teeth.

of curved cross-head racks o, formed upon the ends of an equal-armed lever, p, pivoted to the frame A. lYith this construction one of the shafts B B will be moved loi'igitudinally in one direction bythe movement of the other shaft in the other direction, and both shafts will be made to move at the same rate of speed. This construction is especiallyconvenient when only one side of the machine is used, or when the shafts B B have tool-holders at only one end, so that the tool attached to the one shaft may be withdrawn by the vadvance of the tool attached to the other shaft.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In a machine forcut-tiug bolt-threads and tapping nuts, the combination, with the sliding rotary shafts B B that carry the tools, of the ring gear teeth u and the equal-armed lever p, having curved cross-head racks 0 upon its ends, substantially as herein shown and described, whereby the one shaft is moved longitudinally in one direction by the longitudinal movement ot' the other shaft in the other direction, as set forth.

2. In a machine for cutting bolt-threads and tapping nuts, the work-holders constructed substantially as herein shown and described, consisting of the stationary lower plate, T, having notches YV X a, the stationary upper plate, U, having notches W X Z, and Athe intermediaterevolvin g plate or head, Q, attached to the spindle I), and having notches R S, whereby the Work is received, held while being operated upon, and discharged, and the chips can be removed, as set forth.

HENRY B. BUBIN.

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